# In-Plane Magnetic-Field-Induced Quantum Anomalous Hall Plateau Transition

## TL;DR

This paper investigates the critical properties of magnetic-field-induced quantum anomalous Hall transitions in axion insulators, highlighting the role of mirror symmetry breaking and material-specific phenomena.

## Contribution

It demonstrates how in-plane magnetic fields induce QAH transitions in MnBi2Te4 and explores the potential emergence of Majorana fermions in related materials.

## Key findings

- Mirror symmetry breaking induces QAH transition in MnBi2Te4.
- Majorana fermions may emerge in MnBi4Te7 and MnBi6Te10.
- QAH transition belongs to the integer quantum Hall universality class.

## Abstract

We study the critical properties of the in-plane magnetic field-induced quantum anomalous Hall (QAH) plateau transition in axion insulators. Take even septuple layer film MnBi$_2$Te$_4$ as a concrete example, we find the mirror symmetry breaking from in-plane field could induce axion insulator to QAH insulator transition, which belongs to generic integer quantum Hall plateau transition. The chiral Majorana fermion does not necessarily emerge at the QAH plateau transition in MnBi$_2$Te$_4$ due to strong exchange field, but may be quite feasible in its descendent materials MnBi$_4$Te$_7$ and MnBi$_6$Te$_{10}$.